package acmCoder;

import java.util.Scanner;

public class AC2003 {

	public static void main(String[] args) {
		Scanner scanner =new Scanner(System.in);
		while (scanner.hasNext()) {
			double a=scanner.nextDouble();
			System.out.printf("%.2f\n",a>0?a:-a);
		}
		scanner.close();
	}
}
